Thermal analysis hydrodynamics study on FeS

The oxidative tendency of FeS was studied by the thermal gravimetric analysis (TG) and differential scanning calorimetry (DSC). The hydrodynamics parameters of FeS were calculated using multiple heating rate method. The results show that there are two peaks in the DSC curve of FeS sample. The first peak, which appears at about 143°C, arose from the transformation of FeS phase, and the second peak, presenting at high temperature, is the result of FeS oxidated. The rule of mass constant→ mass gain → mass loss → mass constant emerges in the TG curve of FeS. But the initial temperature of FeS oxidation is high and the oxidational course is long. The activated energy of FeS was 125.89 kJ/mol and the pre-exponential factor is equal to 1.55763 × 10¹¹s^-1. The oxidative reaction of FeS is up to the Avrami-Erofeev kinetic model and the conversion function is G(α)=[-ln(1-α)]^0.4124.